Front truck for street-sweeping machines



c. w. LUND.

FRONT TRUCK FOR STREET SWEEPING MACHINES. APPL iCATION FILED MAR. 10.1921.

1,418, 1 54. Patented May 30, 1922.-

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C. W. LUND.

APPUCATION FILED MAR. l0 192i.

Patented May 30, 1922.

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O O I O I i o M Q] C. W. LUND.

v FRONT TRUCK FOR STREET SW EEPING MACHINES.

APPUCATION FILED MAR- I0. 192].

Patented May 30, 1922.

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FRONT TRUCK FOR STREET-SWEEPING MACHINES.

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Original application filed. April 11, 1819, Serial No. 289,326.

Specification of Letters Patent.

Patented MaySU, 1922." Divided and this application filed March 10,1921. Serial No. 451,150.

To all whom it may concern:

Be it known that I,,CI-IARLns IV. LUND, a citizen-of the United States,residing at lVillows, in the county of Glenn and State of California,have invented certain new and useful Improvements in Front Trucks forStreet-Sweeping Machines; and I do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This application is a division of my allowed U. application, Serial No.289,326 filed April 11, 1919, and for a full description of any detailsof construction not herein specifically described, reference may be hadto this parent case.

The principal object of my invention is to provide a novel form of truckfor supporting the front end of a street sweeping machine in such amanner as to permit the front wheels todrop into depressions and rideover projections without elevating or lowering the entire front of themachine and without exerting any torsional or twisting action thereon.In carrying out this object, I make use of several novel features ofconstruction andunique arrangements of parts, as hereinafter. fullydescribed and claimed, the descriptive matter being supplemented by theaccompanying drawings.

Figure 1 is a side elevation of the street sweeping machine supported atits front end by the improved truck.

Figure 2 is a front elevation of the machine shown in Fig. 1.

Figure 3 is a side elevation partly broken away and in section, showingmore clearly the construction of one of the trucks.

Figure 4 is a horizontal sectional view as indicated by line 4-4 of Fig. 3.

Figures 5 and 6 are vertical transverse sectional views as designated bylines 5-5 and 6-6 of Fig. 3.

In the drawings above briefly described, the numeral 1 designates themain body or housing of a motor driven street sweeping machine mountedon front and rear wheels 2 and 3, the front wheels being driven by anypreferred means such as chains 8,while suitable provision is made forsteering the rear wheels 3.

The front wheels 2 are mounted in trucks 12, one of which is detailed inFigs. 3 to 6. The front and rear brackets 13 and 13 respective'ly arerigidly secured to the sides of the housing 1 or to the frame of suchhous ng as required, and each of said brackets includes a base let, aninner side bar 15 and an outer side bar 16, the two bars lti and 16 ofeach bracket being parallel throughout the greater part of their lengthsand being by preference secured together at their upper ends as clearlyshown'in F igs.

2, 5 and 6. Two parallel horizontal. bars 17 extend between the twobrackets 13 and 13 and contact with the inner sides of the bars 15 and16, and by means of a pin 18 passing through the front ends of said bars17 and the bracket 13, the former are pivot ed. Spacing sleeves 19,mounted on' 1316. bolts 20, are preferably provided between the frontends of the bars 17 as illustrated'in Figs. 3and 4 and in addition, aU-shaped pin 18passes through the ends 23 and said" ends serve to guidethe bars 17 in their pivotal movement upon the pin 18.

At their rear ends, nected by a U-shaped bar 24 vWhoseends are rivetedthereto at 25 (see Fig. 5). Thejbar' 21 and the base 1 1 of the bracketI provided with alined openings through which vertical bolts 26 extend,said bolts rising above the bars 17 and carrying an abutment 27. Coilsprings 28 are interposed between the abutment 27 and the bar 2st and itwill thus be seen that since the wheel 2 is mounted between the bars 17,vertical movement of said wheel with respect to the remainder of themachine is yieldably resisted by the springs 28. The front end of themachine is thus mounted in avmanner to permit the front wheels to dropinto depressions or ride over obstructions, without warping or exertinga torsional action on the entire machine. The rear end of the machine issupported yieldably by means of springs 29 from the axle 30 of thewheels 3, and these parts are preferably located beneath the .rearwardlyprojecting portion 31 of the housing 1.

From the foregoing, taken in connection with the accompanying drawings,it will be seen that I have provided a comparatively the bars 17 are consults are obtainable from simple truck structure for carrying out theobject of the invention, yet that the arrange 7 sides of said side bars,a wheel mounted bebars, the latter being tween said horizontal pivotedto the side bars of one of said brackets, a transverse bar connectingthe ends of said horizontal bars in the other bracket, a bolt risingfrom the base of said other bracket through an opening in saidtransverse bar, said bolt having an abutment spaced above saidftransverse bar, and a coiled spring interposed between said'abutment andsaid transverse bar.

2. Ina truck, front and rear fixed brackets, one of which includes abase and parallel vertical side bars rising therefrom, a pair ofparallel horizontal, bars extending between said brackets and contactingwith the inner sides of said side bars, a wheel mounted between saidhorizontal bars, means pivoting said horizontal bars to said side bars,a transverse bar secured to the base of said one bracket and havingupturned ends contacting withthe inner sides of said horizontal bars,and spring means associated with the other bracket and horizontal barsfor yieldably controlling the movement of the latter about their pivotalaxis.

3. In a truck, front and rear fixed brackets, one of which includes abase and vertical side bars rising therefrom, a pair of horizontal barspivoted to the other bracket and positioned in sliding contact with theinner surfaces of said side bars, a transverse bar extending betweensaid parallel bars and having its ends bent upwardly and secured to thelatter, said transverse bar being positioned over said base, a boltrising from'said base through an opening in said transverse bar, saidbolt having an abutment above said transverse bar, a coil springinterposed between this transverse bar and said abutment, and a wheelmounted between said horizontal bars.

a. In a truck, front and rear fixed brackets each including a base andparallel, vertical side bars rising therefrom, a pair of parallelhorizontal bars extending between said brackets and contacting with theinner sides of said side bars, a wheel mounted between said horizontalbars, a pivotpin connecting the front ends of said horizontal bars withthe side bars of said front bracket,

spacing means for said front ends of said horizontal bars, a transversebar bent into U-shape with its upturned ends secured to the rear ends ofsaid horizontalbars, bolts passing through openings in the base of therear bracket and in said U-shaped bar, and rising above the latter, anabutment on the upper ends offsaid bolts and coiled springs letween saidabutment and said Ushaped CHARLES WALTER LUNDi 5. A structure asspecified in claim l, said spacing means consisting of a U-shaped bar

